[Tutor] Which exceptions should I be catching?

[Wesley Brooks]

>
> That's why you should write an error log ;)


The error log is a valid point. Is there a way to capture the error messages
that go the the terminal window or command prompt rather than all my print
statements? Can this be set up as a global thing for the whole application
rather than inside each thread?

try:
>     put your function here
> except:
>     print 'oops! an error occurred!'
>

I'll probably resort to this and have done in a couple of other occasions,
but thought it was generally frowned upon! I Guess I could do that and print
out anything caught by the exception into a log and go more specific at a
later date.

Cheers,

Wesley Brooks



> On Mon, Oct 20, 2008 at 3:30 PM, Wesley Brooks <wesbrooks at gmail.com>wrote:
>
>> Unfortunately due to the nature of the program the error has normally
>> happened hours ago and the error message has disappeared from the buffer of
>> the command prompt.
>>
>
> That's why you should write an error log ;)
>
>
>>
>> This is the function:
>>
>> def CommandFileWriter(self, command):
>>   name1 = os.path.join(self.commandsdir, command + '.temp')
>>   name2 = os.path.join(self.commandsdir, command)
>>   comfile = open(name1, 'w')
>>   comfile.close()
>>   if not os.path.exists(name2):
>>     os.rename(name1, name2)
>>   else:
>>     os.remove(name1)
>>
>> This was the best way I could come up with doing the function. So the file
>> is written to the correct directory with a wrong name (so the other program
>> will ignore it) then it's name is changed to the correct name with
>> os.rename. Unfortunately I think in freak occations the other program can
>> read and delete the file (running on a multicore processor system) during
>> the rename operation. Can you suggest which errors I should be trying to
>> catch?
>>
>
> I'm not sure what errors to catch, but it's always possible to use a
> general catchall (I'm not sure if this is particularly pythonic)
>
> try:
>     put your function here
> except:
>     print 'oops! an error occurred!'
>
> Or do something besides print an error (such as write a message to a
> logfile. If you include the time stamp and some other info that might be
> helpful that may give you some more insight as to where the problem is, and
> if it's something you can fix.)
>
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